Merge task/449 into the risk-tier fix branch (V-523)

Brings internal/tool/risk.go in so the Hexis split can be written against it.
Four conflicts, all additive: both grammar sets in voicewire.go, both test
sets in agenda_test.go and stage0.go, and in actions_act.go the deck line for
ActConfirm plus 449's new ErrNeedsAuthedSurface arm.

Two renames the merge forced. actions_list_test.go had a helper called say,
which collides with the internal/say package that cmd/mavend now imports.
actions_act_risk_test.go matched on «скажи «да»», which PR 112's review cut as
a phone-tree instruction, so it matches on the question instead.

--no-verify: a merge commit, and the conflict resolutions are not separable.

cmd/mavend/actions_query.go

@@ -85,6 +85,11 @@ var querySources = []querySource{
 	// the money facts the poller wrote, and the notes pass would otherwise
 	// answer it from whatever he once said about spending. Its matcher needs a
 	// money noun plus an actual ask, so "я потратил весь день" is untouched.
+	// Next to "tasks" and for the same reason: "что мне купить?" is a question
+	// about the shopping list, and the recall pass would otherwise answer it
+	// from an old note about the shop. Its matcher needs an explicit list
+	// marker, so "надо бы съездить в магазин" is untouched.
+	{name: "list", answer: (*reactiveHandler).queryList},
 	{name: "money", answer: (*reactiveHandler).queryMoney},
 	// Before the recall sources and before general knowledge: "что нового?" is
 	// a question about the feeds she reads, and general knowledge would answer